Compressor and Air Conditioning System

ABSTRACT

A compressor and an air conditioning system. The compressor includes a low-pressure-stage compressor body and a high-pressure-stage compressor body, where the low-pressure-stage compressor body is provided with a low-pressure-stage suction port and a low-pressure-stage exhaust port, the high-pressure-stage compressor body is provided with a high-pressure-stage suction port and a high-pressure-stage exhaust port, a communication pipeline is arranged between the low-pressure-stage exhaust port and the high-pressure-stage suction port, the low-pressure-stage suction port communicates with a low-pressure-stage gas source, and the high-pressure-stage suction port has a first state of communication with the low-pressure-stage exhaust port and a second state of communication with the low-pressure-stage gas source.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the United States national phase of International Application No. PCT/CN2019/127963 filed Dec. 24, 2019, and claims priority to Chinese Patent Application No. 201910730916.5, filed on Aug. 8, 2019, the disclosures of which are hereby incorporated by reference in their entirety.

BACKGROUND OF THE DISCLOSURE

The present disclosure relates to the technical field of a compression device, and in particular, to a compressor and an air conditioning system.

DESCRIPTION OF RELATED ART

A stand-alone two-stage screw compressor has the working principle as follows: two pairs of screw rotors are connected in series through a shaft coupling; Refrigerant is fed into a high-pressure-stage rotor cavity for compression after entering into a low-pressure-stage rotor cavity for compression through the compressor, and finally the refrigerant is discharged with ultra-high pressure gas. The main method is that low-pressure-stage refrigerant is compressed into ultra-high pressure gas through a two-stage compression technology. The compressor is often applied to technologies of ultra-high temperature heating and ultra-low temperature freezing and refrigeration.

When applied to a heat pump unit, the stand-alone two-stage compressor is mainly used for ultra-high temperature heating due to the high pressure ratio of the compressor and generally applied to cold winters or very cold regions. In other seasons or warmer regions, the pressure ratio required by the unit is much smaller than that of the compressor thereon, thereby causing the compressor to be in a low-power operation or an overcompression state for a long time and leading to waste of resources.

It should be noted that the statements in this part are merely intended to provide background information relevant to the present disclosure, and do not necessarily constitute the prior art.

SUMMARY OF THE DISCLOSURE

A first aspect of the present disclosure provides a compressor, including a low-pressure-stage compressor body and a high-pressure-stage compressor body, where the low-pressure-stage compressor body is provided with a low-pressure-stage suction port and a low-pressure-stage exhaust port, the high-pressure-stage compressor body is provided with a high-pressure-stage suction port and a high-pressure-stage exhaust port, a communication pipeline is arranged between the low-pressure-stage exhaust port and the high-pressure-stage suction port, the low-pressure-stage suction port communicates with a low-pressure-stage gas source, and the high-pressure-stage suction port has a first state of communication with the low-pressure-stage exhaust port and a second state of communication with the low-pressure-stage gas source.

In some embodiments, the communication pipeline is provided with a three-way valve, and a first inlet of the three-way valve communicates to the low-pressure-stage exhaust port; a second inlet of the three-way valve communicates with the low-pressure-stage gas source; an outlet of the three-way valve communicates with the high-pressure-stage exhaust port; in the first state, the first inlet communicates with the outlet; and in the second state, the second inlet communicates with the outlet.

In some embodiments, the compressor is provided with suction ports, a low pressure outlet and a high pressure outlet, the suction ports communicate with the low-pressure-stage gas source, and the low-pressure-stage suction port and the second inlet communicate with the suction ports; in the first state, the low pressure outlet communicates with the low-pressure-stage exhaust port, and the high pressure outlet communicates with the high-pressure-stage exhaust port; and in the second state, the low pressure outlet communicates with the low-pressure-stage exhaust port and the high-pressure-stage exhaust port respectively.

In some embodiments, the low-pressure-stage compressor body has the same internal pressure ratio as the high-pressure-stage compressor body.

In some embodiments, the working mode of the compressor includes a heating mode and a cooling mode;

in the cooling mode, the high-pressure-stage suction port is in the second state, and the low-pressure-stage compressor body or the high-pressure-stage compressor body has the internal pressure ratio satisfying the requirement of the cooling mode; and

in the heating mode, the high-pressure-stage suction port is in the first state, and the collective result of the internal pressure ratio of the low-pressure-stage compressor body and high-pressure-stage compressor body satisfies the requirement of the heating mode.

In some embodiments, the working mode of the compressor includes a first heating mode and a second heating mode;

in the first heating mode, the high-pressure-stage suction port is in the second state, and the low-pressure-stage compressor body or the high-pressure-stage compressor body has the internal pressure ratio satisfying the requirement of the heating mode; and

in the second heating mode, the high-pressure-stage suction port is in the first state, and the collective result of the internal pressure ratio of the low-pressure-stage compressor body and high-pressure-stage compressor body satisfies the requirement of the second heating mode.

In some embodiments, the compressor further includes a motor, where the motor is arranged between the low-pressure-stage compressor body and the high-pressure-stage compressor body, and connected with the low-pressure-stage compressor body and the high-pressure-stage compressor body.

In some embodiments, the low-pressure-stage suction port is arranged at an end of the low-pressure-stage compressor body away from the motor, the low-pressure-stage exhaust port is arranged at an end that is of the low-pressure-stage compressor body and close to the motor, the high-pressure-stage suction port is arranged at an end that is of the high-pressure-stage compressor body and close to the motor, and the high-pressure-stage exhaust port is arranged at an end of the high-pressure-stage compressor body away from the motor.

A second aspect of the present disclosure provides an air conditioning system, including the compressor.

DESCRIPTION OF DRAWINGS

To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description show some embodiments of the present disclosure, and persons of ordinary skill in the art may still derive other drawings from these accompanying drawings.

FIG. 1 is a schematic structural diagram of a compressor according to an embodiment of the present disclosure;

In the Figure:

1. Low-pressure-stage compressor body; 2. High-pressure-stage compressor body; 3. Communication pipeline; 11. Low-pressure-stage suction port; 12. Low-pressure-stage exhaust port; 21. High-pressure-stage suction port; 22. High-pressure-stage exhaust port; 4. Three-way valve; 41. First inlet; 42. Second inlet; 43. Outlet.

DETAILED DESCRIPTION

To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following further describes the compressor and the air conditioning system the present disclosure through embodiments and with reference to the accompanying drawings.

It should be understood that the embodiments herein are merely used to explain the present disclosure, instead of limiting the present disclosure.

The compressor as shown in FIG. 1 includes a low-pressure-stage compressor body 1 and a high-pressure-stage compressor body 2, where the low-pressure-stage compressor body 1 is provided with a low-pressure-stage suction port 11 and a low-pressure-stage exhaust port 12, the high-pressure-stage compressor body 2 is provided with a high-pressure-stage suction port 21 and a high-pressure-stage exhaust port 22, a communication pipeline 3 is arranged between the low-pressure-stage exhaust port 12 and the high-pressure-stage suction port 21, the low-pressure-stage suction port 11 communicates with a low-pressure-stage gas source, and the high-pressure-stage suction port 21 has a first state of communication with the low-pressure-stage exhaust port 12 and a second state of communication with the low-pressure-stage gas source. The suction source of the high-pressure-stage suction port 21 is switched as required; when high-pressure-stage ratio output is required, fluid compressed by the low-pressure-stage compressor body 1 can be fed into the high-pressure-stage compressor body 2 and compressed again so as to implement high-pressure-stage ratio output; when conventional pressure ratio is required, the low-pressure-stage compressor body 1 or the high-pressure-stage compressor body 2 can be selected separately for compression to meet the demand; when conventional pressure ratio and large displacement output are required, gas in the low-pressure-stage gas source is simultaneously sucked by the low-pressure-stage compressor body 1 and the high-pressure-stage compressor body 2, conducted for first-stage compression and discharged, so as to meet the large displacement output.

The communication pipeline 3 is provided with a three-way valve 4, and a first inlet 41 of the three-way valve 4 communicates to the low-pressure-stage exhaust port 12; a second inlet 42 of the three-way valve communicates with the low-pressure-stage gas source; an outlet 43 of the three-way valve communicates with the high-pressure-stage exhaust port 21; in the first state, the first inlet 41 communicates with the outlet 43; and in the second state, the second inlet 42 communicates with the outlet 43; the three-way valve 4 includes a valve plate; when the first inlet 41 communicates with the outlet 43, the second inlet 42 is closed by the valve plate; when the second inlet 42 communicates with the outlet 43, the first inlet 41 is closed by the valve plate.

The compressor is provided with suction ports, a low pressure outlet and a high pressure outlet, the suction ports communicate with the low-pressure-stage gas source, and the low-pressure-stage suction port 11 and the second inlet 41 communicate with the suction ports; in the first state, the low pressure outlet communicates with the low-pressure-stage exhaust port 12, and the high pressure outlet communicates with the high-pressure-stage exhaust port 22; and in the second state, the low pressure outlet communicates with the low-pressure-stage exhaust port 12 and the high-pressure-stage exhaust port 22 respectively.

The low-pressure-stage compressor body 1 has the same internal pressure ratio as the high-pressure-stage compressor body 2, so that the final discharge pressure of the compressor is relatively stable when the low-pressure-stage compressor body 1 and the high-pressure-stage compressor body 2 are discharged simultaneously.

In some embodiments, the working mode of the compressor includes a heating mode and a cooling mode:

in the cooling mode, the high-pressure-stage suction port 21 is in the second state, and the low-pressure-stage compressor body 1 or the high-pressure-stage compressor body 2 has the internal pressure ratio satisfying the requirement of the cooling mode; and in the heating mode, the high-pressure-stage suction port 21 is in the first state, and the collective result of the internal pressure ratio of the low-pressure-stage compressor body 1 and high-pressure-stage compressor body 2 satisfies the requirement of the heating mode.

In some embodiments, the working mode of the compressor includes a first heating mode and a second heating mode:

in the first heating mode, the high-pressure-stage suction port 21 is in the second state, and the low-pressure-stage compressor body 1 or the high-pressure-stage compressor body 2 has the internal pressure ratio satisfying the requirement of the cooling mode; and

in the second heating mode, the high-pressure-stage suction port 21 is in the first state, and the collective results of the internal pressure ratio of the low-pressure-stage compressor body 1 and high-pressure-stage compressor body 2 satisfies the requirement of the heating mode.

Specifically, the second heating mode is a super-high temperature heating mode.

The compressor further includes a motor, where the motor is arranged between the low-pressure-stage compressor body 1 and the high-pressure-stage compressor body 2, and connected with the low-pressure-stage compressor body 1 and the high-pressure-stage compressor body 2.

The low-pressure-stage suction port 11 is arranged at an end of the low-pressure-stage compressor body 1 away from the motor, the low-pressure-stage exhaust port 12 is arranged at an end that is of the low-pressure-stage compressor body 1 and close to the motor, the high-pressure-stage suction port 21 is arranged at an end that is of the high-pressure-stage compressor body 2 and close to the motor, and the high-pressure-stage exhaust port is arranged at an end of the high-pressure-stage compressor body 2 away from the motor.

An embodiment of the present disclosure also provides an air conditioning system, including the compressor of the foregoing embodiment.

The above-mentioned embodiments are merely intended for presenting several implementation manners of the present disclosure with more specific and detailed descriptions, but should not be understood as a limitation on the scope of the present disclosure. It should be noted that the persons of ordinary skill in the art also may make several modifications and improvements without departing from the concept of the present disclosure, and these modifications and improvements fall within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to appended claims. 

1. A compressor, comprising: a low-pressure-stage compressor body with a low-pressure-stage suction port and a low-pressure-stage exhaust port, wherein the low-pressure-stage suction port is configured to communicate with a low-pressure-stage gas source; a high-pressure-stage compressor body with a high-pressure-stage suction port and a high-pressure-stage exhaust port; and a communication pipeline arranged between the low-pressure-stage exhaust port and the high-pressure-stage suction port, wherein the high-pressure-stage suction port has a first state of communication with the low-pressure-stage exhaust port and a second state of communication with the low-pressure-stage gas source.
 2. The compressor according to claim 1, wherein the communication pipeline is provided with a three-way valve, and a first inlet of the three-way valve communicates with the low-pressure-stage exhaust port; a second inlet of the three-way valve is configured to communicate with the low-pressure-stage gas source; an outlet of the three-way valve communicates with the high-pressure-stage exhaust port; in the first state, the first inlet communicates with the outlet; and in the second state, the second inlet communicates with the outlet.
 3. The compressor according to claim 2, wherein the compressor is provided with a suction port, a low pressure outlet and a high pressure outlet, the suction port is configured to communicate with the low-pressure-stage gas source, and the low-pressure-stage suction port and the second inlet communicate with the suction port; in the first state, the low pressure outlet communicates with the low-pressure-stage exhaust port, and the high pressure outlet communicates with the high-pressure-stage exhaust port; and in the second state, the low pressure outlet communicates with the low-pressure-stage exhaust port and the high-pressure-stage exhaust port respectively.
 4. The compressor according to claim 3, wherein the low-pressure-stage compressor body has the same internal pressure ratio as the high-pressure-stage compressor body.
 5. The compressor according to claim 1, wherein a working mode of the compressor comprises a heating mode and a cooling mode; in the heating mode, the high-pressure-stage suction port is in the first state, and the collective result of the internal pressure ratio of the low-pressure-stage compressor body and high-pressure-stage compressor body satisfies the requirement of the heating mode; and in the cooling mode, the high-pressure-stage suction port in the second state, and each of the internal pressure ratios of the low-pressure-stage compressor body and the high-pressure-stage compressor body satisfies the requirement of the cooling mode.
 6. The compressor according to claim 1, wherein a working mode of the compressor comprises a first heating mode and a second heating mode; in the first heating mode, the high-pressure-stage suction port is in the second state, and each of the internal pressure ratios of the low-pressure-stage compressor body and the high-pressure-stage compressor body satisfies the requirement of the heating mode; and in the second heating mode, the high-pressure-stage suction port is in the first state, and the collective result of the internal pressure ratios of the low-pressure-stage compressor body and high-pressure-stage compressor body satisfies the requirement of the second heating mode.
 7. The compressor according to claim 1, further comprising a motor, wherein the motor is arranged between the low-pressure-stage compressor body and the high-pressure-stage compressor body and connected with the low-pressure-stage compressor body and the high-pressure-stage compressor body.
 8. The compressor according to claim 7, wherein the low-pressure-stage suction port is arranged at an end of the low-pressure-stage compressor body away from the motor, the low-pressure-stage exhaust port is arranged at an end of the low-pressure-stage compressor body close to the motor, the high-pressure-stage suction port is arranged at an end of the high-pressure-stage compressor body close to the motor, and the high-pressure-stage exhaust port is arranged at an end of the high-pressure-stage compressor body away from the motor.
 9. An air conditioning system, comprising the compressor according to claim
 1. 10. An air conditioning system, comprising the compressor according to claim
 4. 11. An air conditioning system, comprising the compressor according to claim
 8. 